Today I was working with a pipeline component which encrypted fields in an XML message, for sensitive information. I realized that I needed to use it with a Flat File disassembler, which means that the original message was not XML, so I had to put my component after the Flat File disassembler. For various reasons, I wanted to use my component no later than the Dissasembler stage for this scenario.

So first, I added IDisassemblerComponent to the list of interfaces being implemented in my pipeline component class.

Then, I added the following code:

      private bool beginMessage = false;
      private IPipelineContext pContext;
      private IBaseMessage pInMsg;

      void IDisassemblerComponent.Disassemble(IPipelineContext pContext, IBaseMessage pInMsg)
      {
          beginMessage = true;
          this.pContext = pContext;
          this.pInMsg = pInMsg;
      }

      IBaseMessage IDisassemblerComponent.GetNext(IPipelineContext pContext)
      {
          if (beginMessage)
          {
              beginMessage = false;
              return Execute(pContext, pInMsg);
          }
          else
          {
              return null;
          }
      }

This will only work if the previous disassembler is supposed to produce one message.

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4/29/2010 - Changed the code to reflect changes suggested by Johan Rex...